%作者 : lws
%时间 : 2021/12/19
%正确
syms t s

F1s = (4*s+5)/(s^2+5*s+6);
f1t = ilaplace(F1s) 
% f1(t) =  7*exp(-3*t) - 3*exp(-2*t)

F2s = (3*s)/((s+4)*(s+2));
f2t = ilaplace(F2s) 
% f2(t) = 6*exp(-4*t) - 3*exp(-2*t)

F3s = (s+5)/(s*(s^2+2*s+5));
f3t = ilaplace(F3s) 
% f3(t) = 1 - cos(2*t)*exp(-t)
